Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f93aba581dbd32e…

MALICIOUS

PDF

40.2 KB Created: 2020-08-21 13:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3817673c3c028dd95493ef3857497d47 SHA-1: f340bf7db4423354f3d08b1f877fc3dfc7034329 SHA-256: 7f93aba581dbd32e311eac9edc58cfb1b19bef6213ca7f40aecf9f9b240ff7df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though partially corrupted, contains text related to business income and expense coverage, suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=business+income+and+extra+expense+coverage+form
    • http://files.thecowboysnews.com/uploads/1/3/0/7/130738792/nexiroluve_desuda_gajuxupos.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/7405232004.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/lusedugagasenogono.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/27047733535.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/duxijotijom.pdf
    • https://cdn.shopify.com/s/files/1/0434/9198/3512/files/calendario_escolar_2020_e_2020_sep.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7471/files/dewaxunelikufaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/abiding_in_christ.pdf
    • https://cdn.shopify.com/s/files/1/0429/5013/1878/files/ruweduwikozupedidolubex.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/beragegidani.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/r_random_number_generator.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe3.bin
6ef4b82f75fa0eb2d2be3077166565448f3d44786ce4817c73008918f4679e84
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE3 5620 bytes
font_01_sfnt_off000072ea.bin
f729e8df5b2fee208cf073bda82969bdde145df2a2bcfa4173ac13b07550bdb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x72EA 9804 bytes